纤维增强复合材料约束海水海砂混凝土方柱极限应力及极限应变计算方法分析  

Analysis of calculation model for ultimate stress and strain of FRP-confined seawater sea-sand concrete square columns

作　　者：李奔奔 李鹏举 詹瑒 LI Ben-ben;LI Peng-ju;ZHAN Chang(Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 210096,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;School of Civil Engineering and Architecture,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]东南大学东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]南京工业大学土木工程学院,南京211816 [3]南京工程学院建筑工程学院,南京211167

出　　处：《复合材料科学与工程》2022年第2期52-55,74,共5页Composites Science and Engineering

基　　金：东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题基金(CPCSME2019-04);江苏省高等学校自然科学研究面上项目(20KJB560003)。

摘　　要：本文通过纤维增强复合材料约束海水海砂混凝土(SSC)方柱试验数据考察了3个计算模型(Lam模型、Wei模型及Lim模型)对其极限应力及极限应变的适用性及预测精度。分析结果表明,计算模型预测极限应力的精度总体高于预测极限应变的精度。在预测极限应力的3个模型中,Lam模型呈现出相对较高的精度,平均绝对误差AAE最小,为12.4%,Lim模型和Wei模型的AAE分别为16.8%及18.2%。在预测极限应变的3个计算模型中,Lim模型的精度最高(AAE=14.3%),而Lam模型及Wei模型则大幅低估了纤维增强复合材料约束SSC方柱的极限应变,预测值与试验值比值的平均值Mean分别为68.1%和56.1%。故而在这3个模型中,预测极限应力时Lam模型表现出最高精度,在预测极限应变时,Lim模型表现最佳。The applicability and prediction accuracy of three calculation models(Lam′s model, Wei′s model and Lim′s model) for ultimate stress and strain was evaluated based on test database of FRP-confined seawater sea-sand concrete(SSC) square columns. Higher prediction accuracy of models for ultimate stress compared with that of models for ultimate strain can be found through the analysis results. Among the three models for predicting ultimate stress, Lam′s model exhibits relatively higher accuracy with the smallest average absolute error AAE equal to 12.4%. AAE of Lim′s model and Wei′s model is 16.8% and 18.2%, respectively. Among the three models for predicting ultimate strain, Lim′s model has the highest accuracy(AAE=14.3%) while Lam′s model and Wei′s model largely underestimate the ultimate strain of FRP-confined SSC square columns, with the average ratio of prediction value to experimental value Mean equal to 68.1% and 56.1%, respectively. Therefore, among the three models, Lam′s model shows the highest accuracy for ultimate stress prediction, while Lim′s model is the best for ultimate strain prediction.

关 键 词：复材约束 海水海砂混凝土方柱 极限应力 极限应变 预测精度 

分 类 号：TB332[一般工业技术—材料科学与工程]